\begin{frame}{A slide with some bracketed text}

	\begin{itemize}
		\item Some statement {\color{gray} [Some citation]}
		\item Another statement {\color{gray} [Another citation]}
		\item A final statement {\color{gray} [The last citation]}
	\end{itemize}

	\vspace{3ex}
	\begin{center}
		\scriptsize (a small note)
	\end{center}

\end{frame}

